Title :
Test results of long term operation of the superfluid-cooled cryostat for a 1 GHz NMR spectrometer
Author :
Ito, S. ; Miki, T. ; Yoshikawa, M. ; Hamada, M. ; Kawate, Y. ; Hayashi, S. ; Sato, A. ; Kiyoshi, T. ; Matsumoto, F. ; Nagai, H. ; Wada, H. ; Fukui, S. ; Noguchi, T.
Author_Institution :
Kobe Steel Ltd., Japan
fDate :
3/1/2002 12:00:00 AM
Abstract :
A superfluid cryostat for an 1 GHz-NMR magnet has been developed and its performance was tested. The magnet was successfully energized up to 21.6 T corresponding to a resonance frequency of 920 MHz this April. Before the 920 MHz operations, the magnet was operated for 5 months at the 900 MHz field to check the long-term reliability of the cryogenic system. Stable cryogenic performance has been confirmed through this operation. The HeII bath temperature was kept constant below 1.6 K without any trouble related to the cryostat. The resultant heat load at 1.6 K was 0.55 W. The total helium consumption rate was 800 cc/h.
Keywords :
NMR spectrometers; cryostats; heat losses; reliability; spectrometer accessories; superconducting magnets; 1 GHz; 1.6 K; 21.6 T; 920 MHz; He; NMR spectrometer; heat leakage; long term operation; long-term reliability; pressurized superfluid helium; pumping capacity; radiation shields; stable cryogenic performance; superfluid-cooled cryostat; temperature deviation; total helium consumption rate; Cooling; Helium; Magnetic resonance; Magnetic separation; Nuclear magnetic resonance; Particle separators; Spectroscopy; Superconducting magnets; Temperature; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2002.1018652
